I am not using exchange, just pop and smtp. I receive the error whenever sending or receiving attachments over 90 KB. I have created a new .pst, tried different smtp's, uninstalled my internet security. I have no problems with attachments using the webmail clients. I have also installed thunderbird and everything works as it should. This is only happening in Outlook 2007. The problems began about a month ago after running fine for 3 months.
Windows 7 64bit ultimate
I created a new user with a new mailbox using the same email address - allowing outlook to automatically configure the email and everything worked!
When I logged back in to the original account and tried a new mailbox and removed the old account then let Outlook auto-configure it again, I still get the error "Task 'firstname.lastname@example.org - Sending' reported error (0800CCC13) : 'Cannot connec to the network. Verify your network connection or modem.'
I am not sure what you mean by "reconfiguring the profile"
Please try to delete the old profile from Control Panel-email and then configure the profile again. I suspect something corrupt in the old profile.
How to create and configure an e-mail profile in Outlook 2007 and Outlook 2003
I deleted the old one and created a new one but no joy. I tried to log the Outlook activity, but could not see a problem.
2010.01.11 14:03:08 SMTP (mail.x.net): <rx> 235 2.0.0 OK Authenticated
2010.01.11 14:03:08 SMTP (mail.x.net): Authorized to host
2010.01.11 14:03:08 SMTP (mail.x.net): Connected to host
2010.01.11 14:03:08 SMTP (mail.x.net): [tx] MAIL FROM: <*****>
2010.01.11 14:03:08 SMTP (mail.x.net): <rx> 250 2.1.0 <*****>... Sender ok
2010.01.11 14:03:08 SMTP (mail.x.net): [tx] RCPT TO: <*****>
2010.01.11 14:03:09 SMTP (mail.x.net): <rx> 250 2.1.5 <*****>... Recipient ok
2010.01.11 14:03:09 SMTP (mail.x.net): [tx] DATA
2010.01.11 14:03:09 SMTP (mail.x.net): <rx> 354 Enter mail, end with "." on a line by itself
2010.01.11 14:03:11 SMTP (mail.x.net): End execution
As Raj suggested, I created a new Windows 7 user account. I opened Outlook 2007 and set it up for the new user with the pop email that wasn't working. This could send and receive emails with larger attachments.
It seems to be a problem with the original Windows 7 user account where Outlook isn't able to send or receive attachments greater than 91 KB.
Then the Windows 7 account could be the stick of the issue.
I recommend you to check the local policy and domain policy on this account.
You can run Secpol.msc to check the local security policy.
You can run Rsop.msc to check the domain policy.
Besides,if you have firewall infront of the network,then please check if you have spcial policy created for this account.